Shulgin Rating Scale

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The Shulgin Rating Scale is a simple scale for reporting the subjective effect of psychoactive substances at a given dosage, and at a given time. The system was developed for research purposes by the American biochemist Alexander Shulgin and detailed in his book PiHKAL (Phenethylamines I Have Known And Loved: A Chemical Love Story).


Shulgin Ratings typically include four components. An identification of the chemical being ingested, a dosage, and a descriptive narrative including the ratings themselves used to describe various moments in time. The chemical itself must be clearly identified, preferably using chemical nomenclature, as opposed to popular or 'street' names. The dosage must be known and communicated, as substances may result in wildly different ratings at different doses. The rating itself gives a comparable value relating to the subjective intensity of the experience, including auditory, visual, emotional, mental, physical and other sensory effects. The narrative may include various Shulgin ratings, noting the time to achieve various levels, for instance:

(with 22 mg) A slow onset. It took an hour for a plus one, and almost another two hours to get to a +++. Very vivid fantasy images, eyes closed, but no blurring of lines between "reality" and fantasy. Some yellow-grey patterns a la psilocybin. Acute diarrhea at about

the fourth hour but no other obvious physical problems. Erotic lovely. Good material for unknown number of possible uses. Can explore for a long time. Better try 20 milligrams next time.

PiHKAL, page 560, in regards to the substance 2C-T-2


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